Almost everything written about silver care is about cleaning it. Conservators who look after museum silver think about it the other way round: cleaning is the part to avoid, and storage is the part that does the work. The reason is chemical, and once it is clear, most of the folk advice about silver either makes sense or falls apart.
What tarnish actually is
Tarnish is not dirt sitting on the surface. It is a new compound grown out of the metal itself. According to the Canadian Conservation Institute, tarnish on silver is silver sulfide (Ag₂S), formed when silver reacts with sulfur-containing gases in the air — most commonly hydrogen sulfide, the same gas a hard-boiled egg gives off. A very thin layer shows up as a faint yellow or golden tint; as it thickens it moves through browns and blues to black.
That one fact explains the most important rule of silver care. Because the tarnish is made from silver atoms that used to be part of the piece, taking the tarnish off means taking that silver away with it. The CCI says so directly: every polishing or chemical tarnish removal takes away some of the underlying silver along with the surface layer.
Why sterling behaves differently from fine silver
Sterling is 92.5% silver. The remaining 7.5% is usually copper, added because pure silver is too soft to hold a shape or a stone. The copper is what makes sterling practical, and it also reacts with the environment on its own terms. It is the reason some commercial cleaners do more harm on sterling than on fine silver: the CCI notes that polishes containing ammonia can dissolve copper from sterling, or from the base metal under silver plate, by forming soluble copper–ammonia compounds. The purity marks that tell you which you have are explained in the purity converter, which covers silver fineness as well as gold.
Silver plate deserves its own caution. The silver on a plated piece is a thin skin over a different metal, often a copper or nickel alloy. Every cleaning that removes silver is removing it from a layer that cannot be replaced by polishing, and once the base metal shows through, no cleaning will hide it.
The three ways tarnish gets removed, and what each one costs
The CCI groups tarnish removal into three approaches, and none of them is free.
- Polish. A mild abrasive in a paste or cloth. It removes tarnish by wearing it off, which also removes a little silver and leaves a pattern of fine scratches. Over decades, repeated polishing visibly softens engraved detail and hallmarks — one reason old marks on much-loved tableware can be hard to read.
- Chemical dip. An acidic solution that dissolves the sulfide. It is fast and easy to overdo, and the CCI warns that acids damage niello, stainless steel knife blades and organic materials such as wood. Dips also get trapped in hollow pieces and joints, where they keep working after you have finished.
- Electrochemical. The aluminium-and-washing-soda method found all over the internet. Rather than dissolving the sulfide, it converts it back towards metallic silver, so it removes less metal than a polish. It is not without a cost: the CCI notes it leaves a dull finish that usually needs polishing afterwards, and that silver cleaned this way may tarnish more quickly than silver that has been polished.
All three will also strip deliberate darkening. Many silver designs rely on blackened recesses — oxidised backgrounds that make a pattern stand out. That darkening is the same compound as tarnish, put there on purpose, and a dip or the foil method cannot tell the difference.
Stopping it forming in the first place
Since the reaction needs sulfur gases to reach the metal, the effective approach is to keep those gases away. The CCI’s storage guidance for collections is straightforward:
- Wrap pieces in acid-free tissue and seal them in polyethylene bags.
- Use a tarnish-inhibiting silver cloth — fabric impregnated with fine silver particles, which react with the sulfur gases before they reach the piece.
- Add activated charcoal, which absorbs the gases, and dry silica gel inside the bag or box.
- Avoid lacquering at home, because an uneven coat tarnishes unevenly underneath.
Handling matters too. The CCI advises clean cotton gloves for museum silver, because the salts and oils on skin leave marks that later show up as fingerprints in the tarnish. For a ring worn every day that is not practical, and it does not need to be: regular wear and a soft cloth tend to keep tarnish from building up on the high points anyway. The advice is aimed at pieces that sit in a drawer.
When cleaning is the right call
None of this means silver should never be cleaned. It means cleaning is a trade — a little silver and a little surface detail in exchange for the look — and the gentlest method that gets the result is the one that costs the least. After any cleaning, the CCI recommends rinsing residues off with a mild non-ionic detergent and distilled water, then drying thoroughly with a soft cloth or warm air, since leftover polish and moisture both encourage the next round of tarnish.
For anything antique, plated, set with stones, or with blackened decoration, the stakes are higher, and a conservator or experienced silversmith can judge what a specific piece can tolerate in a way no general guide can.
Does tarnish change what silver is worth as metal?
Not in any measurable way. Tarnish is an extremely thin surface layer, and the silver content of a piece — what its melt value is calculated from — is set by its weight and its purity, not its shine. What tarnish can affect is how a finished piece looks to someone deciding whether they want it, which is a resale question rather than a metal one. Why those are two separate numbers is explained in melt value is not what your jewellery is worth. Heavy-handed cleaning, on the other hand, can do lasting harm to an antique’s surface that no amount of later polishing reverses.